Punch and die retainer



Sept. 1, 1931. o. K. RICHARD ETAL 1,821,770 i.

Filed Oct. lO

BYA

'' the ball into the recess Patented Sept. 1, 1931 UNITED STATES PATENT OFFICE oTIsl K. RICHARD AND CLEMENT e. RICHARD, vor DETROIT, MICHIGAN, AssIeNons TO ALLIED PRODUCTS CORPORATION, F DETROIT, MICHIGAN, A. CORPORATION or ILLINOIS j PUNCH AND nIn RETAINER Application ledrctober 10, 1925; Serial No. 61,818.

5355 tool Vinto-the holder so that the retaining means may properly engage the tool.

' In our Patent No. 1,393,040, issuedV Octo- 'ber 11, 1921, the tool retainer is shown kin which a spring pressed rball is supported in V:'QSJtl'Ie holderV and a recess is provided inthe shank of the tool in which the ball is adapted to engage. In tting the shank of ythe tool in the holder it is sometimes difficult to position the shank so that the recess correctly "3io registers with the ball and the object of this invention is to provide a means for guiding the tool into the holder so that the ball will correctly engage in the recessprovided therelfor in the tool.

Another object of the invention is to provide a notch at the end of the tool shank for engaging the ball and when this notch has been engaged over the ball the tool may be moved longitudinally of its axis toA guide provided therefor in the tool shank.

- These objects and the several ,novel feay tures of the invention are hereinafter more fully described and claimed and .the pre- '-Boferred form-of construction by which these objects are attained is shown in the accompanying drawings in Whichy Fig. 1 is a section through a punch and die retainer embodying our invention.

F Fig 2 is asection taken on line2-2 of 1g. A l

Fig. 3 is a section taken on line 3 3 of Fig. 1. f

Whilethis invention may be utilized with i540 practically anytool shank We have illustrated a retainer as utilized with a punch and die andas shown in Fig. l the retainer or holder 1 is formedwith an annular flange 2 at the upper end thereof which is secured 1.145 against the punch plate 16 by means of a .member 3 fitting over the said annular flange and encircling the retainer which is secured to the punch plate 16 by the machine screws 17 shown in Fig. 1. Inthis manner the' retainer 1 is secured' to the Punch plate 16 lshankA and is tightly -held in engagementf and a hardened metal insert 21 is provided` i over the tool shank, to absorb the blows fromy the punching operations. Within thev wall of the retainer l is an angularly positioned aperture 4 in which a ball 5 is positioned.'

V'Adjacent the end of the aperture opposite the ball an aperture 6 is provided in which the end of the spring 7 engages the opposite end of the spring engaging against theball 5 as shown. It is noted' that the aperture 4 opens into thecentral aperture at approximately 15 degrees to the longitudinal axis of the tool shank but that the openingbetween the two apertures is less than the diameter of the ball 5 thereby preventing the ball from passing out Vof the aperture 4 at the bottom. As will be notedfrom Fig- 2 the punchshank 8 isprovided with a groove or recess arcuate in cross section, the radius of the said groove being equal toY the radusw of the ball 5. yThis groove or recessin'longiangle of 12 degrees to the longitudinal axis into the curve 20 at the end of the groove or recess. Itk can be seen moreparticularlyV from Figs. 1 andy 2 that the ball 5 extends into the groove or recess :9 in the punch thereinl by the spring 7, the opposite side of the ball atthe same time engaging the angularly positioned wall 19 of the groove yor recess 9. The punch shank l8' as shown in Figs. 1 and 3 is provided with a notch 10e: in alignment with theV4 groove or recess 9 and when the punch shank is inserted in the holder it is positioned so'that the notch 10 engages over the ball 5 whereupon by moving the punch longitudinally Into the holder? the ballis guided into the groove or recess 9 in which the ball `5 seats to hold the punch in the holder; By this arrangement the punch may be properly guided into the holded in relation to the ball 5 so that the ball ytudinal section is provided with an angular H -wall 19 which extends at approximately an 5 properly engages the tool. The diepart Samay be similarly provided .with a notch 10aV adapted to guide the ball 1n the die retainer into the groove or recessg9a 1n the die.

'or chuck Within Which it is secured.

VVhenthe ball is correctly engaged in the respective groove or recess the tool is held from rotation in the retainer and attempted Withdrawal of the punch from the retainer is prevented by the binding action ot' 'the ball 5 between the angularwail of the aperture 4 and the angular Wall of the groove :or recess 9in the punch shank. The angular Wall 19 of the groove or recess is preferably at an angle to the longitudinal axis of the toolso that a tendency to draw the tool out of the hold tends to compress the ball between the Walls 4 and 19 and thus prevents removal of the tool from the retainer. In

order to remove either the punch or the die from the respective retainer the operator may extend ya rod or similar instrument through the aperture 12 or 12a in the flat face of either retainer Aand force the ball 5er 1`5a back into the aperture 4 or la away from andout `of the arcuate groove 9 or 9a in `the punch `,or die respectively whereupon either the punch or die may be easily Withdrawn from the .respective retainer. It VWill 'be noted" that the `retainers yare not limited to use with any certain type of tool but may be used in dfiferent' types of punch presses,` d-ril'l` presses :and other ymachines where a tool inust necessarily :be held from rotation and at the same time from longitudinal movement in relation to the retainer The retainer may be made in diii'erent sizes with ldifferent central apertures to take tools of `vali-ying :sizes and shapes. By positioning the angular apertures 4 and lla shown in Fig. '1 aft opposite angles to the tendency of themdie to travel With the punch is prevented and the tendency o the punch to remain in the die is also prevented 'by the retainers 'here shown.

From the foregoing description it becomes evi-dent that the device is very simple and efficient @in operation Awill not easily get ont of order, is composedoic few .parts yand is Tof consequent low manufacturing cost and pro- *vi-des a device Which accomplishes ,the ob- -jects described.

rjtoo'l is to be introduced, a spring-pressed ball Ehaving a portionthereof extending into the aperture at a distance from the end through which the tool is to be int 1oduced,

'the shank of the ftool having a portion at a distance from its end shaped to provide a sea-t for `the ball, the said portion `being in the` nature of a groove extending longitudinallyof 1Uthe tool `and .at an angleito the 4axis thereof with 'the deepest end Lef the ,groove at the greatest distance from the end of the shank, the said shank Jfurther having an additional groove in the same plane as the first groove and extending` longitudinally of the tool and at an angle to the axis there- :of with ethe deepest portion opening through the shank :end and extending to the surface of the shank adjacent the point of the termination of the groeve forming the ball seat, the said end groove providing va means enabling the operator through rotation of the shank upon its Vintroduction in the aperture to locate the shank through the seating oi the ball in the guide groove whereby on further insertion of the shank 'the ball ridesinto the first groove.

2. In .a l,retainer for punches, dies and similar tools provided with a cylindrical sha-nk, the combination with a member apertured to receive the tool'shank and permit its rotation and a spring-,pressed Imember extending into the shank aperture a slight dista-nce `from the surface of the 'apertured member, the shank of the .tool having a seat for the said spring-pressed member ata distance from its end, and Aa :guide means therefor provided by forming a portion of the tool shank at said end on which the spring-,pressed member may scat through rotation of the shank upon its introduction in the aperture whereby, fon further4 longitudinal movement of the shank intoV the aperture, said spring-pressed member is guided to its final seat.`

3. A retainer Vfor punches. dies and similar tools provided with a cylindrical shank, the combination with a member :having a cylinder -apenture to receive the shank and permitting rotation 'thereof and a springpressed member extend-ing into the shank aperture a slight distance from the surface of the apertured member, the shank ot the tool having a sea-t for the -said springpressed member at :a distance from its fend greater than the Adistance of the springpressed member from the Vsurface of the apertured member, and guide means provided by iiorming a portion of the tool shank at its -end engageable by the springpressed ymember upon introduction and rotation of the shank in the aperture to hold the .tool from rotation in its aperture, whereby on further insertion of the tool in the apertured member the said seat is brought to Iposition to be engaged by thel spring-pressed member.

4. In a retainer for punches, dies and vsimilar tools provided With a cylindrical shank having a chamfered end, a retainer member apertured to receive .the shank and permit its rotation, a spring-pressed member extending into the shank aperture a distance from the face of the apertured member, said tool shank having a seat'for the spring-pressed member at a distance from its end, und a guide means therefor pro-v yided by forming a notch in the eharnfered rend of the tool to a depth below the chainfered edge and in longitudinal alignmenty With the said seat for the spring-pressed member whereby, on insertion of the tool into the aperture therefor until the charnfered edge engages the spring-pressed member, the tool may lbe freely rotated until the spring-pressed member engages the notch at the chamfered end thereby positioning the tool With said seat in correct relation to receive the spring-pressed men1- ber on final insertion yof the tool.

In testimony Wherdeof We signthis specicaton.

OTIS K. RICHARD. CLEMENT C. RICHARD. 

